AstroSkipper

@Mathwiz Of course I don't know how long these remnants of MU will last but deleting the HTTPSProxy CA certificate in HTTPSProxy's program folder let HTTPSProxy generate a new one with duration of 10 years beginning at time of creation I think.

@Mathwiz My ProxHTTPSProxy CA certificate is valid until 2025 but my HTTPSProxy CA certificate is valid until 2030 which was recreated in 2020. I deleted all certificates in \Certs and site certificates were recreated when visiting these sites. I have installed both Proxy versions and after configuring properly they are working on Microsoft Update site without any problems.

@Dave-H Use the folder HTTPSProxy! Both are identical versions except for one file and this is config.ini. In folder HTTPSProxy there is one, in folder Update HTTPSProxy is none due to the idea you will update an existing installation and don't want to loose your settings which would be overwitten by new one. In first installation you have no config.ini so you are working from scratch. I think that was the idea of @Thomas S.. He released two versions but first release had been faulty so users had to update.

@maile3241 As I already mentioned some posts above copy your patched file first to system32\dllcache and then to system32. If it is blocked do it from outside using linux or WinPE. Restart computer and check if both files are still there. And then...hopefully... But one thing I have to say. It would be much easier if you read your posts a little bit more intently. Hope it'll work finally.

@Dave-H You have got a PM just now.

@maile3241 Fine but is your folder male? :)

@Dave-H I know and that for a long time. And therefore I asked you if I were allowed to upload HTTPSProxy due to the fact that @Thomas S. hadn't been here for a long time and he is the author. What do you think? You are a Super Moderator and I think you'll know if I am allowed to or not.

@maile3241 A normal Windows XP Professional system has a folder to backup system files to restore them. This is the dllcache folder. In most systems c:\WINDOWS\system32\dllcache\. I really don't know what kind of system you have. In my dllcache folder there are currently 3426 files. If this folder doesn't exist in your system create one and copy your patched dll into. No more I can say. But you didn't mention if now SFC is disabled and copying of wuaueng.dll is working after this long procedure. Oh @Dave-H is right. Probably you have hidden your system files. Change it in explorer.

@ExtremeGrief I could do that but I didn't. If you want to merge it's up to you. I did it my way as Frankie Boy would say (or better sing). Don't say other people what they should, could or have to do. If you want to do it "better" do it by your own!

@Dave-H Fine. I've added my HTTPSProxy's config.ini so you can use that or compare it to yours. https://www.mediafire.com/file/6emtdvx2vmw4iz8/HTTPSProxy_-_config.ini/file

@Dave-H Of course there are differences. HTTPSProxy ran from the very first I tried to access MU without any problems. Configuring was very easy. ProxHTTPSProxy didn't run from the very first. I had a lot of trials to get it work. Configuring wasn't easy. I had certificate problems too. In HTTPSProxy the certificate management is much easier. Beyond that HTTPSProxy is more user-friendly compared to ProxHTTPSProxy and can be accessed in SysTray at any time incl. switching on and off. By the way did you try my attached ProxHTTPSProxy's config,ini in this post? For me it is working smoothly.

@Dave-H And if you still have problems to access MU you could give HTTPSProxy a try. You can install both on your machine they are portable but do not run both at same time i.e. they may not be executed in RAM at the same time otherwise they interfere. I don't know if I am allowed to upload HTTPSProxy due to the fact that @Thomas S. hasn't been here for a long time and he is the author. What do you think?

@Dave-H Here are the most recent Root Certificates and Revoked Certificates Updater I made yesterday. Download link: https://www.mediafire.com/file/kegkco6y6cbybdx/Roots_Certificate_Updater_18.10.21.7z/file

@maile3241 If there is no such file then it doesn't matter. Copy patched file in both folders and well done! Restart computer and check whether both files are still there. And then

@maile3241 Oh man, dllcache is a subfolder of system32 folder.

@maile3241 I don't know what you are doing. I told you a lot of posts above you have to copy sfc_os.dll to another partition or folder. Windows may not have access to your file. Do not patch this file in folder system32 or system32\dllcache! Then copy your patched file first to system32\dllcache and then to system32.If it is blocked do it using linux or WinPE.

@maile3241 Of course you can. Copy new code, mark this region with your mouse and paste new code, But do not change other bits. Check after patching if only these ten digits have changed. It's the most simple thing.

@maile3241https://imgur.com/AqLdRes Of course you have. In hexeditor all lines are arranged hexadecimal on left side. Find line 0000EC80 and then position (column) 4. Open your eyes! In your screenshot I can see the matching code.

@maile3241 At offset EC84, replace 83F89D7508 by 3BC0EB3290. But first check if code 83F89D7508 matches exactly in your file.

@maile3241 Version 5.1.2600.5512 is what I have and is an original service pack 3 file. And patching is no problem using hexeditor.

@maile3241 Have you already checked if at offset EC84 of your file this code 83F89D7508 matches? You always say the same but you give less information about what you have tried. Use an hexeditor like WinHex and look inside! If code matches then you can patch outside of system32 without any problems.

@Dave-H Such an Intermediate Certificate Authorities called "Microsoft Update Secure Server CA 1" doesn't exist in my system. I agree to @Mathwiz your problem is most likely related to ProxHTTPSProxy. I had applied its cert. installer program "ProxHTTPS Cert Install.exe" too. If the mentioned version doesn't work for you try HTTPSProxy from @Thomas S.. That's what I use most of the time and it works flawlessly. No certificate problems and very comfortable with a launcher in your Taskbar Notification Area (SysTray) and a lot of options.

@maile3241 rshx32.dll is only related to security tab. To disable WFC/SFC you have to patch sfc_os.dll too. I patched this file only to disable SFC permanently. I think this is your source: https://www.neowin.net/forum/topic/600928-xp-home-file-system-hacks/

@maile3241 Then this instruction should work. It is just for your version. My version is higher.

In my system patching of sfc_os.dll was no problem. Which file version do you have? And check the relevant offset using Hexeditor to compare code.